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VISITS of BATS to FLOWERS of Lafoensia Glyptocarpa KOEHNE (LYTHRACEAE) 19

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VISITS of BATS to FLOWERS of Lafoensia Glyptocarpa KOEHNE (LYTHRACEAE) 19 VISITS OF BATS TO FLOWERS OF Lafoensia glyptocarpa KOEHNE (LYTHRACEAE) 19 VISITS OF BATS TO FLOWERS OF Lafoensia glyptocarpa KOEHNE (LYTHRACEAE) SILVA, S. S. P. and PERACCHI, A. L. Instituto de Biologia, Universidade Federal Rural do Rio de Janeiro, CEP 23851-970, Seropédica, RJ, Brazil Correspondence to: Shirley Seixas Pereira da Silva, Rua Salvador de Mendonça, 100, Apto 101, CEP 20261-030, Rio Comprido, RJ, Brazil Received August 11, 1997 – Accepted June 17, 1998 – Distributed February 23, 1999 (With 1 figure) ABSTRACT In the present study visits of phyllostomid bats to the Lafoensia glyptocarpa Kohne flowers were observed at Federal Rural University of Rio de Janeiro, Itaguaí municipality, Rio de Janeiro state. This tree species present floral characteristics to fit the “chiropterophilous syndrome”, encouraging the visit of four species of bats which showed different behavior patterns, according to their size, weight and access to the food resources. Glossophaga soricina (Pallas, 1766) showed hovering be- havior. Phyllostomus hastatus (Pallas, 1767) and Platyrrhinus lineatus (Geoffroy, 1810) showed landing behavior and Artibeus lituratus (Olfers, 1818) fed during the quick flight, without a real landing. Key words: Chiroptera, chiropterophily, bats, flowers, Lafoensia glyptocarpa. RESUMO Visitas de morcegos às flores de Lafoensia glyptocarpa KOEHNE (LYTHRACEAE) No presente trabalho, foram estudadas visitas de morcegos filostomídeos às flores de Lafoensia glyptocarpa Koehne na área da Universidade Federal Rural do Rio de Janeiro. Essa espécie vegetal apresenta atributos florais que estão de acordo com a “Síndrome da Quiropterofilia” e recebe visitas de quatro espécies de morcegos que apresentam comportamento variado ao abordar as flores, conforme o seu tamanho, peso e acesso ao alimento. Glossophaga soricina (Pallas, 1766) adeja, Phyllostomus hastatus (Pallas, 1767) e Platyrrhinus lineatus (Geoffroy, 1810) pousam e Artibeus lituratus (Olfers, 1818) realiza passagens rápidas sem pousar. Palavras-chave: Chiroptera, quiropterofilia, morcegos, flores, Lafoensia glyptocarpa. INTRODUCTION Gardner, 1977; Pijl, 1936/1937; Vogel, 1958/1969). In Lythraceae family, the visit of bats was suggested The importance of utilization of floral re- by Vogel (1958) based on observations of Lafoensia sources by bats has been admitted by several punicifolia DC. specimens, in Panamá. authors such as Alvarez & Quintero (1970), Sazima & Sazima (1975) recorded visits of Carvalho (1961), Gardner (1977) e Heithaus et four phyllostomatid bats to Lafoensia pacari St. al. (1975), due to the great number of plant species Hil. in Brazil. These authors recorded the visit of which receive constant visits of those mammals. Phyllostomus discolor (Wagner, 1843) to Lafoensia The Myrtales order involves families such glyptocarpa flowers in 1977. as Myrtaceae, Melastomataceae, Lythraceae, Since L. pacari has four bat species which Sonneratiaceae e Onagraceae which receive visits visit their flowers, and there was indication of one of bats belonging to Pteropodidae and Phyllos- only species visiting L. glyptocarpa, we studied tomidae families (Dobat & Piekert-Holle, 1985; this plant in order to verify existence of other bat Rev. Brasil. Biol., 59(1): 19-22 20 SILVA, S. S. P. and PERACCHI, A. L. species that utilize its pollen and nectar as food Capsular dry fruits with winged seeds were resources. observed in the L. glyptocarpa specimens studied. In such case, we recorded four species of bats visiting the flowers of Lafoensia glyptocarpa in Nocturnal Visitors: Rio de Janeiro state. Every bat showed different Moths (Sphingidae) and bats were recorded behavior patterns of aproximation to flowers, ac- on Lafoensia glyptocarpa flowers. Four bats spe- cording to their size and weight. cies were recorded visiting flowers. Glossophaga soricina: small bat, with fore- MATERIAL AND METHODS arm measuring from 30.0 to 39.0 mm and medium weight of 10.3 g. This species visited flowers, after During June and July 1989, flowers of 18:00 h, in group of more than five individuals Lafoensia glyptocarpa, were observed at Federal which hovered briefly in front of the flowers while Rural University of Rio de Janeiro campus thrusting its snout inside the corolla to reach for (22o45’S and 43o41’WGr), Itaguaí municipality, nectar. During the visit, the stames touched the Rio de Janeiro state. back, chest, head and womb portion of the wing Flowers of Lafoensia glyptocarpa were (Fig.1). observed in sessions from 17:00 h to 23:00 h. Mist Phyllostomus hastatus: big bat with forearm nets measuring 12 x 2.6 m were extended in front measuring from 88.5 to 90.0 mm and medium of canopy, in order to catch nocturnal visitors. weight of 111.0 g. Only one individual was re- Slides with pollen were done for posterior corded visiting alone L. glyptocarpa flowers, comparison with material found on the animals shortly at nightfall. The bat approaches the flower (Silva,1991). Plant voucher specimens are depos- landing briefly, holding on branch with feet, ited at the herbarium of Departamento de Botânica keeping the wing backwards, and left the flower. of UFRRJ. The bat returned to the flowers, approaching them During observation period, the number of rapidly. In both approaches, only the higher flowers bats visitors and their behaviour on the inflores- were visited. cences were recorded. In order to confirm the visit Platyrrhinus lineatus: bat with forearm slides with pollen found on the fur and gastrointes- measuring from 44.6 to 50.6 mm and medium tinal tract of each bat were done by direct method weight of 25.0 g. The bat arrived at flowers in (Silva, 1991). Specimens of bats were deposited group of three individuals which landed on the as voucher in the Adriano L. Peracchi collection, branches through feet and thumbs. During the visit, Instituto de Biologia of UFRRJ, (ALP: 5291, 5292, the bat thrusted its head among the stames to reach 5293, 5294, 5295 and 5296). for nectar, causing its head, faces and chest to be dusted with pollen.The bats approach the flow- RESULTS ers from lower and middle portion of canopy. Artibeus lituratus: big bat with forearm Description of the plant: measuring from 65.0 to 75.0 mm and medium Lafoensia glyptocarpa, is a tree that mea- weight of 72.0 g. This bat visited flowers alone sures aproximately eight meters of height. The in- in quick flights to obtain pollen and nectar. There florescences are simple racemes, with big was not a real landing, and the individuals approach hermafrodite flowers. Each flower bears fifteen the flowers from upper and middle portion of free stamens which are disposed around the cup. canopy. The pollen was adhered on the snout. The anthers are yellow in the color. The visit of G. soricina, A. lituratus e P. The blooming period extends from May to lineatus were not concomitant. There was a shift July. Anthesis begins at 17:30 h and the nectar is times among these species, along the night. First available in very large amounts, dripping out of G. soricina; second A. lituratus, and at last, P. the cup. The flowers last only one nigth and the lineatus. stamens are retracted and wilted in following Only P. hastatus visited the flowers shortly morning, and the petals unfastened from the cup. at nigtfall, after arrival of other bats. Rev. Brasil. Biol., 59(1): 19-22 VISITS OF BATS TO FLOWERS OF Lafoensia glyptocarpa KOEHNE (LYTHRACEAE) 21 DISCUSSION study. This similarity is due to size and weight of bats since. P. hastatus and P. discolor are big Lafoensia glyptocarpa, has all the needed bats, with weight varying from 50.0 to 100.0 g. characteristics to fit the “chiropterophilous syn- Therefore, these bat species do not hover in front drome” as defined by Faegri & Pijl (1971). There- of the flowers to reach food. fore, this species receives constant visits of bats Artibeus lituratus shows frugivorous habit, from several subfamilies which search floral re- but this species is able to seek floral resources, sources as food source. pollen and nectar, as food source, in period of food During the visits, different behavior were scarcity (Heithaus et al., 1975). Silva (1991) found recorded, according to the size and weight of bats, pollen of Chorisia speciosa St. Hill on gastrointes- and acess to food resouces. tinal tract of this bat species, during the winter Bats with weight lower than 15.0 g; such the season (July and August). glossophaginae, show hovering behavior. This Sazima & Sazima (1975) recorded visits of behavior pattern was described to G. soricina by A. jamaiscensis (Leach,1821) to flowers of Lafoen- several authors which observed visits of this bat sia pacari; and in the present study we verified to chiropterophilous flowers. G. soricina kept that the foraging behavior of both bat species are hovering behavior while was visiting L. glyptocarpa similar, due to aproximate size and weight (65.0 flowers. However this bat shows landing behav- to 75.0 g) presented by these species. ior when the nectar is inaccessible, as observed in P. lineatus is regarded as frugivorous bat, but Kigelia aethiopica Decne and Kigelia africana there are few data about its feeding habits. This Benth. (Vogel, 1958; Silva, 1991), as well as mixed bat was recorded visiting flowers of Musa behavior, as observed by Carvalho (1960) in Alexa acuminata Colla (Sazima, 1976) and L. pacari grandiflora Duke and Crataeva benthamii Eich. (Sazima & Sazima, 1975). In both observations, Phyllostomus hastatus was observed by the behavioral pattern is similar to that reported Carvalho (1960) while was visiting flowers of to L. glyptocarpa. Parkia gigantocarpa Duke and its behavior is Gribel (1986) observed that P. lineatus visited similar to that recorded in Lafoensia glyptocarpa, flowers of Caryocar brasiliense Camb; in present but the approaches were not so violent to verge study, the behavior differs only in the position of flowers, inflorescences and buttons. the wings, which are kept backwards during the Sazima & Sazima (1977) observed that vists.
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